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rs6000.h: (rs6000_sched_insert_nops): support new flag -minsert-sched-nops.
* config/rs6000/rs6000.h: (rs6000_sched_insert_nops): support new flag -minsert-sched-nops. (DEFAULT_SCHED_FINISH_NOP_INSERTION_SCHEME): Define. * config/rs6000/rs6000.c: (rs6000_sched_insert_nops): support new flag -minsert-sched-nops. (is_cracked_insn, is_microcoded_insn): New functions. (rs6000_sched_finish): New function. (rs6000_issue_rate): Return 5 for power4. (get_next_active_insn, insn_terminates_group_p): New functions. (is_costly_group, force_new_group): New functions. (redefine_groups, pad_groups): New functions. (rs6000_variable_issue): Use new functions. * doc/invoke.texi (-minsert-sched-nops): Document new option. From-SVN: r72707
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